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@ 2013-07-23T08:11:55Z

<?php
$ori=json_decode(<<<JSON
[{"category":"ABC","orderID":"12345","Name":"Pen","Name2":"Black"},
{"category":"ABC","orderID":"34545","Name":"Pencil","Name2":"White"},
{"category":"ABC","orderID":"34545","Name":"Pen","Name2":"Black"},
{"category":"DEF","orderID":"12345","Name":"Pencil","Name2":"Black"},
{"category":"DEF","orderID":"12345","Name":"Pen","Name2":"White"}]
JSON
,true);
$result=array();
while($row=array_shift($ori))//Pretend that we're fetching record from DB
{
	$result[$row["category"]][$row["orderID"]][]=array("Name"=>$row["Name"],"Name2"=>$row["Name2"]);
}
print_r($result);//This should be better
//But if you insist, this can help:
array_walk($result,function(&$v,$k){
	$x=array("category"=>$k,"children"=>array());
	array_walk($v,function($arr,$oid)use(&$x){
		$x["children"][]=array("orderID"=>$oid,"children"=>$arr);
	});
	$v=$x;
});
print_r(array_values($result));

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [ABC] => Array ( [12345] => Array ( [0] => Array ( [Name] => Pen [Name2] => Black ) ) [34545] => Array ( [0] => Array ( [Name] => Pencil [Name2] => White ) [1] => Array ( [Name] => Pen [Name2] => Black ) ) ) [DEF] => Array ( [12345] => Array ( [0] => Array ( [Name] => Pencil [Name2] => Black ) [1] => Array ( [Name] => Pen [Name2] => White ) ) ) ) Array ( [0] => Array ( [category] => ABC [children] => Array ( [0] => Array ( [orderID] => 12345 [children] => Array ( [0] => Array ( [Name] => Pen [Name2] => Black ) ) ) [1] => Array ( [orderID] => 34545 [children] => Array ( [0] => Array ( [Name] => Pencil [Name2] => White ) [1] => Array ( [Name] => Pen [Name2] => Black ) ) ) ) ) [1] => Array ( [category] => DEF [children] => Array ( [0] => Array ( [orderID] => 12345 [children] => Array ( [0] => Array ( [Name] => Pencil [Name2] => Black ) [1] => Array ( [Name] => Pen [Name2] => White ) ) ) ) ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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